Table 2. A summary of short inter­atomic contacts (Å) in (I)^a .

Contact	Distance	Symmetry operation
O2⋯H2Nb	1.94	1 − x, 1 − y, 1 − z
C1⋯H13	2.79	−1 + x, y, −1 + z
N1⋯H4Ob	1.65	−1 + x, −1 + y, −1 + z
O3⋯H1	2.50	1 + x, 1 + y, 1 + z
N4⋯H6Ob	1.60	1 + x, y, 1 + z
O5⋯H3Nb	2.02	−x, 1 − y, 1 − z
O1⋯H28	2.57	−x, 1 − y, 1 − z
O1⋯H6B	2.32	−x, 1 − y, 1 − z
C8⋯H20	2.61	x, y, z
C12⋯C21	3.39	x, y, z
C8⋯C26	3.35	x, −1 + y, z
O5⋯H2	2.35	x, y, z
O3⋯H9B	2.56	x, 1 + y, z
C17⋯H9B	2.69	x, 1 + y, z
O3⋯H12	2.23	1 − x, 2 − y, 2 − z
C21⋯H25	2.62	1 − x, 2 − y, 1 − z
C18⋯H27	2.67	x, y, z
O4⋯H24	2.58	1 − x, 2 − y, 1 − z

Notes: (a) The inter­atomic distances are calculated in Crystal Explorer 17 (Turner et al., 2017 ▸) whereby the X—H bond lengths are adjusted to their neutron values; (b) these inter­actions correspond to conventional hydrogen bonds.